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En-tte Retry-After - HTTP | MDN
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  1. Web
  2. HTTP
  3. Rfrence
  4. En-ttes
  5. Retry-After
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En-tte Retry-After

L'en-tte de rponse HTTP Retry-After indique pendant combien de temps l'agent utilisateur doit attendre avant d'effectuer une requte de suivi. Il existe trois cas principaux d'utilisation de cet en-tte :

  • Dans une rponse 503 Service Unavailable, il indique pendant combien de temps le service est cens tre indisponible.
  • Dans une rponse 429 Too Many Requests, il indique pendant combien de temps attendre avant d'effectuer une nouvelle requte.
  • Dans une rponse de redirection, comme 301 Moved Permanently, il indique le temps minimum que l'agent utilisateur doit attendre avant d'mettre la requte redirige.
Type d'en-tte En-tte de rponse

Dans cet article

Syntaxe

http
Retry-After: <http-date>
Retry-After: <delay-seconds>

Directives

<http-date>

Une date aprs laquelle ressayer. Voir l'en-tte Date pour plus de dtails sur le format de date HTTP.

<delay-seconds>

Un entier dcimal non ngatif indiquant le nombre de secondes attendre aprs la rception de la rponse.

Exemples

Grer les interruptions planifies

La prise en charge de l'en-tte Retry-After ct clients et serveurs reste ingale. Cependant, certains robots d'exploration, comme Googlebot, respectent l'en-tte Retry-After. Il est utile de l'envoyer avec une rponse 503, afin que les moteurs de recherche continuent d'indexer votre site lorsque la panne est termine.

http
Retry-After: Wed, 21 Oct 2015 07:28:00 GMT
Retry-After: 120

Spcifications

Spcification
HTTP Semantics
# field.retry-after

Compatibilit des navigateurs

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  1. HTTP
  2. Guides
  3. Un aperu de HTTP
  4. L'volution du protocole HTTP
  5. Une session HTTP typique
  6. Messages HTTP
  7. Types de mdia
    1. Liste des types MIME communs
  8. Compression dans HTTP
  9. Mise en cache HTTP
  10. Authentification HTTP
  11. Utiliser les cookies HTTP
  12. Redirections en HTTP
  13. Requtes conditionnelles HTTP
  14. Requtes d'intervalle en HTTP
  15. Indications du client
  16. User-Agent reduction
  17. Transport du dictionnaire de compression
  18. Network Error Logging
  19. La ngociation de contenu
    1. Valeurs par dfaut de Accept
  20. Dtection du navigateur avec la chane de caractres d'AU
  21. Gestion des connexions dans HTTP/1.x
  22. Mcanisme de mise niveau du protocole
  23. Proxy servers and tunneling
    1. Proxy Auto-Configuration (PAC) file
  24. Scurit et confidentialit
    1. HTTP Observatory
    2. Practical implementation guides
    3. Feature Policy
    4. Cross-Origin Resource Policy (CORP)
    5. IFrame credentialless
    6. Fetch metadata
    7. Cross-Origin Resource Sharing (CORS)
    8. Erreurs CORS
      1. Raison : CORS dsactiv
      2. Raison : l'en-tte CORS Access-Control-Allow-Origin ne correspond pas xyz
      3. Raison : l'en-tte CORS Access-Control-Allow-Origin est manquant
      4. Reason: CORS header 'Origin' cannot be added
      5. Reason: CORS preflight channel did not succeed
      6. Raison: la requte CORS a chou
      7. Reason: CORS request external redirect not allowed
      8. Raison : la requte CORS n'utilise pas HTTP
      9. Reason: Credential is not supported if the CORS header 'Access-Control-Allow-Origin' is '*'
      10. Reason: Did not find method in CORS header 'Access-Control-Allow-Methods'
      11. Reason: expected 'true' in CORS header 'Access-Control-Allow-Credentials'
      12. Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Headers'
      13. Reason: invalid token 'xyz' in CORS header 'Access-Control-Allow-Methods'
      14. Reason: missing token 'xyz' in CORS header 'Access-Control-Allow-Headers' from CORS preflight channel
      15. Reason: Multiple CORS header 'Access-Control-Allow-Origin' not allowed
    9. Content Security Policy (CSP)
      1. Errors and warnings
  25. Rfrences
  26. En-ttes HTTP
    1. Accept
    2. Accept-CH
    3. Accept-Encoding
    4. Accept-Language
    5. Accept-Patch
    6. Accept-Post
    7. Accept-Ranges
    8. Access-Control-Allow-Credentials
    9. Access-Control-Allow-Headers
    10. Access-Control-Allow-Methods
    11. Access-Control-Allow-Origin
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    13. Access-Control-Max-Age
    14. Access-Control-Request-Headers
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    87. Range
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    90. Refresh
    91. Report-To
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    93. Repr-Digest
    94. Retry-After
    95. RTT
    96. Save-Data
    97. Sec-Browsing-Topics
    98. Sec-CH-Device-Memory
    99. Sec-CH-DPR
    100. Sec-CH-Prefers-Color-Scheme
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  27. Mthodes de requte HTTP
    1. CONNECT
    2. DELETE
    3. GET
    4. HEAD
    5. OPTIONS
    6. PATCH
    7. POST
    8. PUT
    9. TRACE
  28. Codes de statut de rponse HTTP
    1. 100 Continue
    2. 101 Switching Protocols
    3. 102 Processing
    4. 103 Early Hints
    5. 200 OK
    6. 201 Created
    7. 202 Accepted
    8. 203 Non-Authoritative Information
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    11. 206 Partial Content
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    14. 226 IM Used
    15. 300 Multiple Choices
    16. 301 Moved Permanently
    17. 302 Found
    18. 303 See Other
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    20. 307 Temporary Redirect
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    24. 402 Payment Required
    25. 403 Forbidden
    26. 404 Not Found
    27. 405 Method Not Allowed
    28. 406 Not Acceptable
    29. 407 Proxy Authentication Required
    30. 408 Request Timeout
    31. 409 Conflict
    32. 410 Gone
    33. 411 Length Required
    34. 412 Precondition Failed
    35. 413 Payload Too Large
    36. 414 URI Too Long
    37. 415 Unsupported Media Type
    38. 416 Range Not Satisfiable
    39. 417 Expectation Failed
    40. 418 I'm a teapot
    41. 421 Misdirected Request
    42. 422 Unprocessable Entity
    43. 423 Locked
    44. 424 Failed Dependency
    45. 425 Too Early
    46. 426 Upgrade Required
    47. 428 Precondition Required
    48. 429 Too Many Requests
    49. 431 Request Header Fields Too Large
    50. 451 Unavailable For Legal Reasons
    51. 500 Internal Server Error
    52. 501 Not Implemented
    53. 502 Bad Gateway
    54. 503 Service Unavailable
    55. 504 Gateway Timeout
    56. 505 HTTP Version Not Supported
    57. 506 Variant Also Negotiates
    58. 507 Insufficient Storage
    59. 508 Loop Detected
    60. 510 Not Extended
    61. 511 Network Authentication Required
  29. Directives CSP
    1. base-uri
    2. block-all-mixed-content
    3. child-src
    4. connect-src
    5. default-src
    6. fenced-frame-src
    7. font-src
    8. form-action
    9. frame-ancestors
    10. frame-src
    11. img-src
    12. manifest-src
    13. media-src
    14. object-src
    15. prefetch-src
    16. report-to
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    19. sandbox
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    21. script-src-attr
    22. script-src-elem
    23. style-src
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  30. Directives Permissions-Policy
    1. accelerometer
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    3. aria-notify
    4. attribution-reporting
    5. autoplay
    6. bluetooth
    7. browsing-topics
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    11. compute-pressure
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    13. deferred-fetch
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    17. fullscreen
    18. gamepad
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    20. gyroscope
    21. hid
    22. identity-credentials-get
    23. idle-detection
    24. language-detector
    25. language-model
    26. local-fonts
    27. local-network
    28. local-network-access
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    30. magnetometer
    31. microphone
    32. midi
    33. on-device-speech-recognition
    34. otp-credentials
    35. payment
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    37. private-state-token-issuance
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    39. publickey-credentials-create
    40. publickey-credentials-get
    41. screen-wake-lock
    42. serial
    43. speaker-selection
    44. storage-access
    45. summarizer
    46. translator
    47. usb
    48. web-share
    49. window-management
    50. xr-spatial-tracking
  31. Ressources et spcifications sur HTTP
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